She said that it appeared that "some Russian supporters were dancing and jumping on the escalator".
RAI, the state television broadcaster, aired a video of the incident, showing the escalator suddenly accelerating, with people piling up at the bottom.
An escalator in a Rome metro station broke on Tuesday, injuring 20 people, majority CSKA Moscow football fans, according to Italian police.
The official Twitter account for Rome's emergency services tweeted a photo of the mangled escalator.
Ansa said more than 20 people had been hurt, majority suffering leg injuries.
An escalator at a Rome Metro station malfunctioned on Tuesday, inexplicably speeding up and sending dozens of riders onto the floor. The metropolitan station at Piazza Repubblica near the main Termine train station was closed by investigators.
The horrific events took place around 1730 GMT, just over an hour before the kickoff of a Champions League match between Italy's Roma and Russian club CSKA Moscow.
A number of people were seriously injured in the incident.
The Repubblica-Teatro dell'Opera Station was crowded with fans of the visiting Russian soccer team CSKA Moscow, which was playing a game nearby.